<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <header>定义网页头部</header>
  <nav>定义导航栏区域</nav>
  <article>定义文章区域</article>
  <aside>定义侧边栏</aside>
  <footer>定义页脚区域</footer>
  <section>定义区域</section>
  <input type="text" value="" list="star"/>
  <datalist id="star">
    <option>刘德华</option>
    <option>刘若英</option>
    <option>刘欢</option>
    <option>刘晓庆</option>
    <option>张学友</option>
    <option>郭富城</option>
    <option>张家辉</option>
    <option>张静</option>
  </datalist>

  <fieldset>
    <legend>用户登录</legend>
    用户名：<input type="text">
    <br><br>
    密   码：<input type="password" name="" id=""> 
  </fieldset>
</body>
</html>